JPS6310690A - Method of quenching in dry coke quenching facility - Google Patents

Abstract

PURPOSE:To effectively and stably utilize a cooling and quenching energy of red-hot coke, by controlling the temp. of a circulation gas on the inlet side of a waste heat boiler at a particular temp. and, at the same time, adjusting the difference in the amount between a circulation gas component and a standard gas component with a replenishment gas. CONSTITUTION:The temp. of a circulation gas which has been used for cooling and quenching red-hot coke 10 within a cooling tower 12 is detected with a thermometer 39 provided in a high temp. circulation gas pipe 18 around the inlet side of a water heat boiler 14. When the detected temp. is below the upper value of the inlet side control temp. of the boiler 14, a flow rate control valve 34 is regulated with a temp. controller 40 to introduce a diluting air, thereby burning the circulation gas to raise the temp. of the circulation gas, while the temp. is above the upper value, a by-pass device 24 is operated with a controller 40 to introduce a low-temp. circulation gas present in a low-temp. circulation gas pipe 16, thereby lowering the temp. of the circulation gas. Further, a circulation gas component of which the heat has been recovered with the boiler 14 is detected with a gas analyzer 50 provided in the pipe 16 around the inlet of the cooling tower, and the difference in the amount between the circulation gas and a predetermined standard gas is adjusted with a calorie controller 52 by feeding a waste gas as a replenishment gas from a combustion furnace 42.

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a fire extinguishing method for dry coke extinguishing equipment, and in particular, red-hot coke discharged from a coke oven is cooled and extinguished with an inert gas, and heated by heat exchange by this cooling extinguishing. The present invention relates to an improvement in a fire extinguishing method for dry coke fire extinguishing equipment in which the inert gas is recovered as steam by a waste heat boiler.

[Conventional technology]

For example, as shown in FIG. 2, the dry coke extinguishing equipment uses a ladle 100 taken out of a coke oven (not shown)
A cooling tower 2 into which red-hot coke 1 at 0°C is charged, an arrangement 2 (hereinafter referred to as low-temperature side circulating gas piping) 3 for blowing cooling gas into this cooling tower 2, and cooling tower 2 to cool the red-hot coke. Heat M of the cooling gas heat exchanged by extinguishing the fire
a waste heat boiler 4 for recovering the gas as steam, a pipe (hereinafter referred to as the high temperature side If!ITM gas pipe) 5 for blowing cooling gas from the cooling tower 2 into the waste heat boiler 4, and the low wet open circulation gas pipe. a circulating gas 1 rear circulation fan 6 installed at 3;
The high temperature tI! It consists of an air fan 7 and piping 8 installed in the first circulating gas piping 5. Therefore, in the above-mentioned dry coke extinguishing equipment, red-hot coke 1 discharged from the coke oven is cooled and extinguished with an inert gas, and the heat amount of the heated inert gas is converted into The heat boiler 4 recovers it as steam. Also, as mentioned above! The dilution air sent to the high-temperature side circulating gas distribution unit 5 by the dilution air fan 7 and piping 8 has a flow rate determined based on the detection signal of the gas component 1 degree and gas temperature of the circulating gas in the circulating gas piping 5. so that a, II I
It has been done. Further, the surplus of circulating gas generated by introducing the station air into the station is taken out as surplus gas from the surplus gas extraction pipe N9. The introduction of the dilution air prevents the risk of gas explosion and gas leakage caused by the concentration of non-volatile components (H2, CO, etc.) in the circulating gas from the red-hot coke 1 charged into the cooling tower 2. Avoid the danger of doing so! I get attacked by Kome. In such a dry coke extinguishing system, from the viewpoint of the surplus gas, the higher the gas calorie of the surplus gas, the more it is used! You can say that l1fli is high. As a method for utilizing the surplus gas, for example, Japanese Patent Application Laid-open No. 5
As disclosed in Publication No. 4-124002, a method for recovering excess circulating gas is proposed in which the introduction of diluting air is reduced as much as possible so that the circulating gas composition becomes a predetermined composition. has been done. In this method of recovering surplus circulating gas, the combustible components in the circulating gas are combusted by the introduction of the diluting air, and this combustion reduces the caloric value of the circulating gas, which limits the introduction resistance of the diluting air. However, an attempt is made to set an upper limit on the calorie value. Further, as disclosed in Japanese Patent Application Laid-Open No. 60-112882, a method has been proposed in which a dilution gas is introduced using combustion exhaust gas from a coke oven as a dilution gas for the circulating gas. In this dilution gas introduction method, CO2 in the combustion gas of the coke oven reacts with red-hot coke in the cooling tower, resulting in C+ CO2→2GO1C+
H20→CO+H2, and the force of the circulating gas can be increased.

[Problems to be solved by the invention]

However, depending on the method proposed above, the introduction of dilution air is restricted or combustion exhaust gas is introduced instead of dilution air, which causes a decrease in the circulating gas temperature, which causes a drop in the circulating gas line. The problem is that the amount of steam generated by the waste heat boiler installed in the waste heat boiler decreases. In other words, reducing the flow rate of dilution air or replacing it with other combustion exhaust gas instead of introducing dilution air will increase the caloric value of the circulating gas, but the temperature of the circulating gas will decrease due to the heat generated by the red-hot coke in the cooling tower. Since the temperature rise is mainly caused by the exchange, there is a problem that the boiler inlet gas temperature becomes low and the amount of steam generated in the waste heat boiler decreases. On the other hand, when the flow rate of dilution air is increased, the circulating gas is combusted, so that the circulating gas discharged from the cooling tower becomes more waterfall, which can increase the inlet gas temperature of the waste heat boiler. . Therefore, it is possible to increase the amount of steam generated. However, 1i! Since the I-ring gas is combusted, the combustible components in the circulating gas are reduced, which causes a problem in that the power value of the recovered gas, which is recovered as surplus gas, is reduced.

[Purpose of the invention]

The present invention has been made to solve the above-mentioned conventional problems, and is a dry coke that can increase the amount of steam generated in the waste heat boiler and reduce nitriding, and increase the calories and recovery of surplus gas. The purpose is to provide a fire extinguishing method for fire extinguishing equipment.

[Means for solving the problem 1] The present invention charges red hot coke discharged from a coke oven into a cooling tower, blows cooling gas into the cooling tower to cool and extinguish the red hot coke, and performs heat exchange. In the fire extinguishing method of dry coke fire extinguishing equipment, the cooling gas heated by Dilution air or P circulating gas blown from the cooling tower is introduced into the inlet side of the heat boiler, and the circulating gas temperature is brought to the upper limit of the temperature at the inlet side of the waste heat boiler. At the same time, a change in the circulating gas component with respect to the standard gas component is detected, and supplementary gas is supplied to the next intake side of the cooling tower according to the detected change value.
By adding the above, the objective described in (a) is achieved. (Function) In the present invention, diluting air is introduced into the circulating gas supplied to the inlet side of the waste heat boiler, and by introducing this diluting air, a part of the combustible components of the circulating gas is combusted and the waste heat boiler is heated. The temperature of the circulating gas is raised to the upper limit value of inlet side management mr!1 of In addition, in the process of raising the temperature of the circulating gas by introducing dilution air, if the circulating gas temperature exceeds the upper limit of the inlet side control temperature of the waste heat boiler, the aI circulating gas blown into the cooling tower is discarded. It is supplied to the inlet circulating gas of the heat boiler to control the upper limit of the temperature of the inlet circulating gas of the waste heat boiler.
Therefore, the circulating gas temperature on the inlet side of the 1-heat boiler is always kept constant I
Can be maintained directly. As described above, when the circulating gas temperature is i, IJ '30 and the dry coke extinguishing equipment is operated in a constant state,
It is possible to measure the addition of steam generation 1 in the fully heated boiler and the top of the window. Therefore, by obtaining a constant steam generation m, the cooling heat of red-hot coke can be reused effectively and stably. Further, a change in the circulating gas component with respect to the standard gas component is detected, and supplementary gas is added on the blowing side of the cooling tower in accordance with the detected change value. Therefore, the surplus gas to be recovered can be maintained in a high-strength O-li. Thereby, surplus gas can be used stably. Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the dry coke extinguishing equipment that implements the method of the present invention is charged with red hot coke 10 discharged from a coke oven (not shown), and cools the charged red hot coke 10. A cooling tower 12 that cools by introducing gas, a waste heat boiler 14 that recovers as steam the heat of the cooling gas that is heat exchanged and heated by extinguishing the cold gas by this cooling tower 12, and this waste heat boiler 1
The cooling gas from which the heat was recovered in step 4 is used as a circulating gas tt
A low temperature side circulating gas pipe 16 introduced into the J cooling tower 12,
High temperature side @ ring gas pipe 18 that sends the cooling gas heated by heat exchange in the cooling tower 12 to the waste heat boiler 14
A circulating gas flood condition adjustment neck 20 is connected to the high-temperature side circulating gas piping 18 and adjusts the temperature of the circulating gas by introducing circulating gas dilution air circulating within the circulating gas piping 18.
and a circulating gas component adjusting device 22 connected to the low temperature side circulating gas piping 16 and adding supplementary gas to the circulating gas in the circulating gas piping 16 to adjust the components of the circulating gas to a constant value; The circulating gas piping 16 and the high temperature side circulating gas piping 18 are connected to each other, and the low temperature circulating gas in the low temperature side circulating gas piping 16 is introduced into the high temperature Wi1m gas flowing in the 1ili hot side circulating gas piping 18, thereby causing the Ai hot side circulation. A bypass device 2ff24 that cools the circulating gas in the gas pipe 18 is connected to a downstream position of the circulating gas component adjustment device RA22 of the low-temperature side circulating gas pipe 16, and extracts surplus circulating gas in the circulating gas line. Flammable gas extraction piping 26 for
It is equipped with. The circulating gas temperature vA regulating device 20 includes an air blowing pipe 30 that introduces dilution air into the high temperature side circulating gas pipe 18, and an air blowing fan 32 installed in the air blowing pipe 30. , a flow rate control valve 34 that adjusts the flow rate of air blown by the air blowing fan 32; An air blowing pipe 32 between a temperature 436 for detecting the temperature of the circulating gas flowing in the circulating gas pipe 18 and the air blowing fan 32 and the milk flow control valve 34.
A flow distribution needle 38 is arranged to detect the flow layer of air flowing in the air blowing pipe 30, and a flow distribution needle 38 is arranged to detect the flow layer of air flowing in the air blowing pipe 30, and the circulating gas flowing in the high temperature side circulating gas piping 18 based on the detection signal of the temperature ff+36 and the flow distribution needle 38. and a temperature controller 40 that adjusts the flow rate of dilution air to keep the temperature constant.・The 1Hft surface meter 40 shown in lq is configured to measure the flow a5t3 with the thermometer 36 so that the temperature of the 9 circulation 11 gas sent to the waste heat boiler 14 becomes the upper limit of the inlet side control temperature of the complete heat boiler 14.
The flow mWJ valve 34 is controlled based on the detection signal No. 8. The inlet side control temperature of the waste heat boiler 1/I is determined from the viewpoint of protecting the waste heat boiler 14 and the danger of explosion of the circulating gas, and is usually determined based on the range of 650 to 900 ° C. ing. More specifically, this inlet pipe yJ
! The upper limit of temperature is ff! This is determined from the viewpoint of protecting the waste heat boiler 14 from deterioration of the material of the tube for heat exchange of the mature boiler 14. In addition, the lower limit of the entrance side control temperature is
It is determined from the viewpoint of the lowest temperature at which the circulating gas reaches combustion when diluting air is introduced. The circulating gas component adjustment device 22 includes an exhaust gas supply pipe 44 that introduces exhaust gas from various combustion furnaces 42 into the circulating gas in the low temperature side circulating gas pipe 16, and the exhaust gas supply pipe 44.
A flow control valve 46 which is arranged in the pipe and controls the exhaust gas flow device in the pipe, a flow meter 18 which detects the flow rate of the exhaust gas flowing in the supply pipe 44, and a flow meter 18 which is arranged in the low temperature side circulating gas pipe 16. A gas analyzer 50 is installed on the cooling tower 12 side, and in order to keep the components of the circulating gas flowing through the low-temperature side circulating gas pipe 16 constant, the detection signals of the Makki flow meter 48 and the gas analyzer 50 are used. A calorie controller 5 that adjusts the flow rate of exhaust gas from the combustion furnace 42 that is supplied to the circulating gas flowing through the pipe 16 based on the
It is composed of 2. The calorie controller 52 is configured to control the supply of combustion exhaust gas based on changes in gas components in the circulating gas determined by the gas analyzer 50. The flow of combustion exhaust gas into the circulating gas is optimally controlled by this change in gas components.The gas analyzer 50 detects the circulating gas components that have changed due to the introduction of diluting air, using the circulating gas components that provide a predetermined force as a standard gas. The detected gas component is compared with the standard gas component, and the exhaust gas supply 8 is controlled based on the comparison result, so that the circulating gas is reacted with the red hot coke 10 in the cooling tower 12 to a predetermined level. The temperature of the ingredients is maintained. The gas analyzer 50 includes an infrared type GO/CO2 meter for detecting Co/CO2, a magnetic wind type or magnetic type 02 meter for detecting 02, and a thermal conductivity meter for detecting 02. It consists of a formula H2 meter. An analyzer based on the same measurement principle, such as the Hakugasc O Madograph, may also be used. The infrared type CO2 meter irradiates infrared rays from an infrared light source to the gas flowing through the measurement cell, and detects Co and CO2 components based on the attenuation of the infrared rays. The magnetic wind 202 meter is uncontained in the measuring gas chamber. Create a field, detect that a magnetic wind proportional to the oxygen content is generated in a place with a strong magnetic field, and convert this magnetic wind to V to 0.
2ffi. The magnetic type 02 meter is configured to generate an intermittent magnetic field in the measurement gas chamber using an electromagnet, etc., and detect Ot@ based on the pressure generated when oxygen in the gas is attracted to the electromagnet. has been done. The thermal conductivity 2H2 meter detects Hzm by utilizing the fact that heat conduction from a heated platinum wire is affected by gas components and temperature. The calorie controller 52 determines the exhaust gas supply from the combustion furnace 42 based on the detected value of Co1H2, which is the main component of the circulating gas, based on the detection result of the gas analyzer 50,
The exhaust gas from the combustion furnace 42 is introduced into the low temperature side circulating gas piping 16 to keep the circulating gas degree in the piping constant. The exhaust gas from the combustion furnace 42, which is thus added to the circulating gas in the low-temperature side circulating gas pipe 16, reacts with the red-hot coke 10 in the cooling tower 12, resulting in CO
11"2 will be increased. Further, based on the introduction of dilution air from the circulating gas temperature control device 20 and the introduction of exhaust gas from the calcining furnace 42 from the circulating gas component control device δ22, the amount of v1 ring gas in the low temperature side circulating gas piping 16 is increased. Accordingly, surplus gas generated by introducing the dilution air and exhaust gas is taken out from the circulating gas line via the flammable gas take-out pipe 26 and reused as combustible gas. 1) The bypass device 24 also includes a bypass piping 54 that connects the low-temperature side circulating gas heating 16ζ with the flat side circulating gas piping 18 by 1''A, and a flow installed in the bypass piping 54] Section 11. This bypass device fi24 is configured such that dilution air is introduced into the circulating gas in the high-temperature side circulating gas piping 18 by the circulating gas temperature control device 20, and by introducing this diluting air, the circulating gas is This is activated when the gas exceeds the upper value of the inlet side control temperature of the waste heat boiler 14. In other words, the circulating gas temperature control g
dilution air is introduced into the circulating gas by the device 20;
When the circulating gas is combusted by introducing this dilution air and its temperature exceeds the upper limit of the inlet side control temperature of the waste heat boiler 14, the low temperature side circulating gas pipe 16 is inserted into the high temperature side circulating gas pipe 18. The flow rate of the low-temperature circulating gas flowing therein is controlled and introduced. The flow regulating valve 56 of the bypass narrow @ 24 is controlled by the 1 degree TA m St 40 of the circulating gas temperature A/P device 20 . According to this embodiment, the circulating gas that has cooled and extinguished the red hot coke 10 in the cooling tower 12 flows into the high temperature side circulating gas pipe 18 near the inlet side of the waste heat boiler 14; The temperature is detected, and if the detected humidity is above the inlet side control temperature (R value) of the waste heat boiler 1, the ft control valve 34 is adjusted by the temperature control unit 40 to
Dilution air is introduced into the circulating gas flowing through the circulating gas pipe 18, and this introduction combusts the circulating gas to increase its temperature. Also, the temperature of the circulating gas detected by the thermometer 39 is 1!1! on the inlet side of the waste heat boiler 14! ! When the temperature is higher than the upper limit value, the temperature controller 40 turns on the bypass device W12.
4 is activated to introduce the low-temperature circulating gas flowing through the low-temperature side circulating gas piping 16 into the high-temperature side circulating gas, thereby lowering the temperature of the circulating gas. Thereby, the temperature of the circulating gas introduced into the waste heat boiler 14 can be kept constant as the upper limit of the waste heat boiler inlet side management rIA11[. Therefore, by increasing the steam generation calm and -nitriding in the waste heat boiler 14, fluctuations in the steam generation calm can be reduced and the cooling heat of the circulating gas can be reused stably. In addition, the circulating gas whose heat has been recovered by the waste heat boiler 14 is
Low) Q 11 circulating gas piping 16 near the inlet side of the cooling tower 12
The gas analyzer 50 installed in the combustion furnace detects the components, and if the components of the circulating gas differ from the predetermined standard gas components, the calorie controller 52 controls the combustion furnace so that the components of the circulating gas are kept constant. By controlling and supplying the exhaust gas from 42 to its flow rate, the components of the circulating gas blown into the cooling tower 12 and the surplus gas taken out from the flammable gas extraction pipe 26 are always kept constant. Can be done. Thereby, surplus gas having a certain gas component can be stably discharged, and the surplus gas can be stably utilized. Next, actual 1M results of the present invention will be explained. In this embodiment, the dilution air outlet was controlled such that the pH and temperature of the inlet pipe of the waste heat boiler reached a limit of 900°C. At this time, the *m gas flow rate was 190,000 Nv3/Hour, and the dilution air flow m was 500ONm''/t1hour. value is 8
The combustion exhaust gas was introduced into the circulating gas piping from a combustion furnace 42 such as a coke oven so that the amount was 50 KcaJ2/Nm'. The composition of the circulating gas obtained by this is Co
18%, H210%, GO27%, 8205%, N
2 It became 60%. In addition, the flow n of the combustion exhaust gas introduced into the low temperature side circulating gas pipe 16 is 10,000 N♂/) lour, and the flow port of the recovered gas recovered from the flammable gas extraction pipe 26 is 950 ONF + 3/H.
Note that in this embodiment, the gas components of the circulating gas were detected using the gas analyzer 50, but the present invention is not limited to this (for example, the gas analyzer may be Alternatively, a gas chromatograph may be used. In this case, gas analysis is performed at appropriate intervals, and the results are used to control the calorie meter 52 of the circulating gas component adjustment device a22. In addition, when controlling the detection of gas components, only the main components of the circulating gas are detected, and the supply of exhaust gas, etc. is controlled based on this detected value.
- It is also possible to perform JO. For example, in the case of supplying exhaust gas, it is possible to adjust the circulating gas components by detecting only the main components, although some fluctuations occur in the recovered gas calories. Further, in the above embodiment, the components of the circulating gas are 1! Although the supplementary gas introduced into the circulating gas in the low-temperature side circulating gas piping 16 in order to reduce energy consumption was exhaust gas from various combustion furnaces 42, the present invention is not limited to this, and instead of the exhaust gas,
It may also be one in which steam, CO, or the like is blown. When adjusting the components of the circulating gas by blowing steam or the like in this way, the components of the circulating gas can be adjusted only by detecting the Co and H2 composition in the circulating gas.

【Effect of the invention】

As explained above, according to the present invention, it is possible to increase the steam generation number of the waste heat boiler in the dry coke extinguishing equipment, to increase the nitridation, and to increase the calories and stabilize the components of the recovered surplus gas. This has the excellent effect that the cold extinguishing heat of red-hot coke can be used effectively and stably.

[Brief explanation of drawings]

FIG. 1 is a front view including a partial block diagram and pipeline diagram showing the configuration of a dry coke extinguishing system that implements the method of the present invention, and FIG. 2 is a pipe diagram showing the configuration of a conventional dry coke extinguishing system. It is a front view including a road map. DESCRIPTION OF SYMBOLS 10... Coke, 12... Cooling tower, 14... Waste heat boiler, 16... Low temperature side circulating gas piping, 18... 1% side circulating gas piping, 20... Circulating gas temperature Regulating device, 22... Circulating gas component regulating device, 24... Bypass device, 26... Combustible gas extraction piping, 40... Temperature controller, 52... Calorie controller.

Claims (1)

[Claims] (1) Red-hot coke discharged from a coke oven is charged into a cooling tower, cooling gas is blown into the cooling tower to cool and extinguish the red-hot coke, and the cooling gas heated by this heat exchange is transferred to a waste heat boiler. A fire extinguishing method for a dry coke fire extinguishing system in which the cooling gas is circulated as a circulating gas to be blown into the cooling tower, wherein dilution air or cooling tower is provided on the inlet side of the waste heat boiler. Introducing the circulating gas on the blowing side of the waste heat boiler, controlling the circulating gas temperature to the upper limit of the inlet side control temperature of the waste heat boiler, and detecting a change in the circulating gas component with respect to the standard gas component,
A fire extinguishing method for dry coke fire extinguishing equipment, characterized in that supplementary gas is added on the blowing side of the cooling tower in accordance with the detected change value.